
package com.market.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class SetCharacterEncodingFilter implements Filter
{

    public SetCharacterEncodingFilter()
    {
        encoding = null;
        filterConfig = null;
        ignore = true;
    }

    public void destroy()
    {
        encoding = null;
        filterConfig = null;
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
            ServletException
    {
        if (ignore || request.getCharacterEncoding() == null)
        {
            String encoding = selectEncoding(request);
            if (encoding != null)
            {
                request.setCharacterEncoding(encoding);
            }
        }
        chain.doFilter(request, response);
    }

    public void init(FilterConfig filterConfig) throws ServletException
    {
        this.filterConfig = filterConfig;
        encoding = filterConfig.getInitParameter("encoding");
        String value = filterConfig.getInitParameter("ignore");
        if (value == null)
        {
            ignore = true;
        }
        else if (value.equalsIgnoreCase("true"))
        {
            ignore = true;
        }
        else if (value.equalsIgnoreCase("yes"))
        {
            ignore = true;
        }
        else
        {
            ignore = false;
        }
    }

    protected String selectEncoding(ServletRequest request)
    {
        return encoding;
    }

    protected String encoding;

    protected FilterConfig filterConfig;

    protected boolean ignore;
}
